There are several empirical formulas to estimate the squat of a ship. Previously, MARIN has assessed methods for inland ships in confined waters. The interaction between ships also has an impact. In the figure, speed and sinkage at the bow were measured on a loaded 110m*11.45m inland ship (draught 3.45m) when it encountered a tanker of 135m*17.6m in the Amsterdam-Rhine Canal (depth of 6m). The tanker had a draught of 3.1m and speed of 13 km/hr. During the encounter, the maximum sinkage increased by more than 100% with respect to the single ship, to approximately 0.45m.